This is to improve page boundaries checking and should probably be cc:stable. I came accross this while debugging nvlink2 passthrough but the lack of checking might be exploited by the existing userspace.
Changes: v4: * 2/2: implemented less strict but still safe max pageshift as David suggested v3: * enforced huge pages not to cross preregistered chunk boundaries v2: * 2/2: explicitly check for compound pages before calling compound_order() This is based on sha1 021c917 Linus Torvalds "Linux 4.18-rc3". Please comment. Thanks. Alexey Kardashevskiy (2): vfio/spapr: Use IOMMU pageshift rather than pagesize KVM: PPC: Check if IOMMU page is contained in the pinned physical page arch/powerpc/include/asm/mmu_context.h | 4 ++-- arch/powerpc/kvm/book3s_64_vio.c | 2 +- arch/powerpc/kvm/book3s_64_vio_hv.c | 6 ++++-- arch/powerpc/mm/mmu_context_iommu.c | 23 ++++++++++++++++++++--- drivers/vfio/vfio_iommu_spapr_tce.c | 10 +++++----- 5 files changed, 32 insertions(+), 13 deletions(-) -- 2.11.0
